function s1_hello(){
  echo"hello,world!"
}

function s2_tell_who_i_am(){
  whoami
}
function s3_which_distro_do_i_use(){
  NAME="Beta Linux"
  echo %NAME
}

function s4_view_my_cpu_arch(){
  uname -m
}

function s5_show_first_scsi_disk_size(){
  lsblk -1 |\grep disk|\grep'^sda'|awk'{print $4}'
}
function s6_show_main_memory_size_in_megabytes(){
free -m|grep "Mem:"| awk '{print $2}'
}

